Scientific Linux Security Update : grep on SL7.x x86_64

Low Nessus Plugin ID 87557


The remote Scientific Linux host is missing one or more security updates.


A heap-based buffer overflow flaw was found in the way grep processed certain pattern and text combinations. An attacker able to trick a user into running grep on specially crafted input could use this flaw to crash grep or, potentially, read from uninitialized memory.

This update also fixes the following bugs :

- Prior to this update, the \w and \W symbols were inconsistently matched to the [:alnum:] character class.
Consequently, using regular expressions with '\w' and '\W' could lead to incorrect results. With this update, '\w' is consistently matched to the [_[:alnum:]] character, and '\W' is consistently matched to the [^_[:alnum:]] character.

- Previously, the Perl Compatible Regular Expression (PCRE) matcher (selected by the '-P' parameter in grep) did not work correctly when matching non-UTF-8 text in UTF-8 locales. Consequently, an error message about invalid UTF-8 byte sequence characters was returned. To fix this bug, patches from upstream have been applied to the grep utility. As a result, PCRE now skips non-UTF-8 characters as non-matching text without returning any error message.


Update the affected grep and / or grep-debuginfo packages.

See Also

Plugin Details

Severity: Low

ID: 87557

File Name: sl_20151119_grep_on_SL7_x.nasl

Version: $Revision: 2.1 $

Type: local

Agent: unix

Published: 2015/12/22

Modified: 2015/12/22

Dependencies: 12634

Risk Information

Risk Factor: Low


Base Score: 2.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2015/11/19

Reference Information

CVE: CVE-2015-1345